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Rotax 912 fuel filter and gasolator

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dhkey(at)msn.com
Guest

Posted: Thu Jul 06, 2006 4:15 am Post subject: Rotax 912 fuel filter and gasolator

912 installation manual calls for a fuel fliter with a mesh size .1 mm 

between the tank and the fuel pump. Where did you find the fuel fliter with 

the .1 mm mesh size?



I'd like to know your thoughts on gasolators and the brands you use. I can 

not put one in the lowest point of the fuel system, it seems to me that one 

anywhere would trap water as long as it runs through it. Is there something 

I don't understand.



Thanks,

David

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Thu Jul 06, 2006 5:33 am Post subject: Rotax 912 fuel filter and gasolator

| I can

| not put one in the lowest point of the fuel system, it seems to me 

that one

| anywhere would trap water as long as it runs through it. Is there 

something

| I don't understand.

|

| Thanks,

| David



David K/Gang:



Water is heavier than gasoline.  If you pull fuel off the top of the 

tank, water remains in the tank.  Pull it out of the bottom of the 

tank and it will then go through the gascolator, which can be drained 

periodically.



I have a homemade gascolator.  Fuel tank outlet is in the lowest part 

of my fuel tank.  Everything comes out of that hole.  Even the last 

drop of fuel.  From the outlet I loop the fuel line under the tailboom 

and back to the Facet Fuel Pump.  At the lowest point of the loop, I 

installed a "T".  From the "T", I run a line forward to the lowest 

point in my fuselage, which is between the gear legs.  I have a Briggs 

and Stratton nylon valve at the end of the line just prior to a 90 deg 

fitting and short piece of fuel line to exit the bottom of the 

fuselage.  It is right next to the vent line from the top of the tank 

that vents out the bottom of the fuselage.  Water and contaminants 

collect in the fuel line that lays in the keel of the airplane.



I have been using a Purolator Fuel Filter, same one, since 1984 on my 

Ultrastar.  Uses nylon mesh filters.



This is the filter:



http://www.midwayautosupply.com/searchby.asp?txtSearch=Purolator&select1=mfg



I did replace the glass cylinder with a piece of aluminum tubing of 

the same size.  First night it was on the Ultrastar the glass cylinder 

cracked and I lost six gals of gas.  I may have overtightened it, or 

it may have been a defective glass part.  However, was not going to 

take another chance of it cracking.  I believe John W flies with the 

same filter, glass cylinder and all.



john h

mkIII

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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

Dennis.Kirby(at)kirtland.
Guest

Posted: Fri Jul 07, 2006 7:50 am Post subject: Rotax 912 fuel filter and gasolator

<< I'd like to know your thoughts on gasolators and the brands you use.

Thanks, David >>



David, and Kolbers -



As John H does, I also use a home made gascolator.  I made it from a 3 inch

long piece of 1.5" diam PVC, with end caps (2) glued on.  (This was an idea

I got from someone else on this List.) It has three fittings: an incoming

fuel nipple, an outgoing fuel nipple (near the top end), and Curtis type

drain valve on the bottom.  Each of these three fittings is threaded into

the PVC gascolator, and sealed a with fuel-proof Permatex goop.  I installed

it at the lowest point in the fuel system, and the drain pokes out the

bottom just aft of the gear legs.  Any water that gets sucked thru the fuel

lines from the tank will collect there, and can be easily drained.



I also use the glass Purolator fuel filter, with the nylon mesh screen.  I

just changed the screen for the first time (at 50 hrs) a few months ago.

Although it looked fairly clean when I changed it, the mesh was actually

full of lint that is not apparent to the eye.  It was nearly clogged.  50

hours is a good target number for changing the fuel filter screen.



Dennis Kirby

Mark-III, 912, in

Cedar Crest, NM

Do not archive

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